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son4ous [18]
3 years ago
8

Jeremy ran 5 yards 2 feet 3 inches. In the same time, John ran 9 yards 1 foot 10 inches. How many inches farther did John run th

an Jeremy
Mathematics
2 answers:
m_a_m_a [10]3 years ago
5 0
5 yards 2 feet 3 inches:
1 yard=36 inches; 5 yards=180 inches
1 foot=12 inches; 2 feet=24 inches
180+24+3=207 inches

9 yards 1 foot 10 inches:
9 yards=324 inches
1 foot=12 inches
324+12+10=346 inches
346-207=139 inches
John ran 139 inches fartheer than Jeremy
adelina 88 [10]3 years ago
4 0
Jeremy: 5 yards, 2 feet, 3 inches
John: 9 yards, 1 foot, 10 inches

You need to find how many inches Jeremy and John ran. There are 36 inches in a yard, so multiply 5 yards by 36.
(5)(36) = 180 inches

There are 12 inches in a foot, so multiply 2 feet by 12.
(2)(12) = 24 inches

Add 180 and 24 inches to 3 inches.
180 + 24 + 3 = 207 inches

Jeremy ran 207 inches.

Now for John:
Multiply 9 yards by 36 inches.
(9)(36) = 324 inches

1 foot = 12 inches

Add 324 and 12 inches to 10 inches.
324 + 12 + 10 = 346 inches

John ran 346 inches.

Subtract Jeremy's run from John's.
346 - 207 = 139 inches

John ran 139 inches farther than Jeremy.
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Use the method of Lagrange multipliers: the Lagrangian is

<em>L</em>(<em>x</em>, <em>y</em>, <em>z</em>) = <em>xyz</em> - <em>λ</em> (<em>x</em> + 2<em>y</em> + 3<em>z</em> - 6)

Find its critical points:

∂<em>L</em>/∂<em>x</em> = <em>yz</em> - <em>λ</em> = 0

∂<em>L</em>/∂<em>y</em> = <em>xz</em> - 2<em>λ</em> = 0

∂<em>L</em>/∂<em>z</em> = <em>xy</em> - 3<em>λ</em> = 0

∂<em>L</em>/∂<em>λ</em> = -(<em>x</em> + 2<em>y</em> + 3<em>z</em> - 6) = 0

Solving the first three equations for <em>λ</em> gives

<em>λ</em> = <em>yz</em> = <em>xz</em>/2 = <em>xy</em>/3

Solve these equations for <em>y</em> and <em>z</em> :

• <em>yz</em> = <em>xz</em>/2   =>   <em>y</em> = <em>x</em>/2   =>   2<em>y</em> = <em>x</em>

• <em>yz</em> = <em>xy</em>/3   =>   <em>z</em> = <em>x</em>/3   =>   3<em>z</em> = <em>x</em>

Substitute these solutions into the last equation and solve for <em>x</em>, then again for <em>y</em> and <em>z</em> :

<em>x</em> + 2<em>y</em> + 3<em>z</em> - 6 = 3<em>x</em> - 6 = 0   =>   3<em>x</em> = 6   =>   <em>x</em> = 2, <em>y</em> = 1, <em>z</em> = 2/3

At this critical point, the maximum volume is

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Given:

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A = P(1+\frac{r}{100} )^{t}

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Now,

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a) The amount of loan after 1 year is $ 4880

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